Ore-roasting furnace.



I No. 7|5,080. Patented Dec. 2, 1902.

AQ c. JOHNSON.

URE RASTING FURNACE.

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GRE HUASTING FURNACE.

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UNTTED STATES PATENT OFFICE.

ALBERT C. JOHNSON, OF BALTIMORE, MARYLAND.

ORE-ROASTING FU RNACE.

SPECIFICATION forming part of Letters Patent No. 715,080, dated December 2, 1902. Application fled April 30, 1902. Serial No.v 105,356. (No model.)

To all whom it may concern:

Be it known that I, ALBERT C. JOHNSON, a citizen of the United States, residing at Baltimore, in the State of Maryland, have invented certain new and useful Improvements in Ore- Roasting Furnaces; and l do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon,which form a part of this specification.

This invention relates to new and useful improvements in ore-roasting furnaces; and it consists in the provision of a rocking or tilting furnace of cylindrical or other shape with horizontal axis and provided with a series of inclined shelves arranged alternately within the furnace, so that the ore which is deposited upon the upper shelf will fall by gravity to the adjacent shelf below as the furnace is tilted in one direction, thence off from the second shelf to the next below when tilted in the opposite direction, and so on until the ore passes from shelf to shelf and finally against the lowest portion of the furnace, from which it will discharge through a suitable outlet.

The invention consists, further, in the provision of means whereby the furnace is tilted and in passage-ways leading from the latter, through which gases are driven off from the material under treatment to chambers or stack.

Other features of the invention will hereinafter appear, which will be fully described and then specifically defined in the appended claims.

The invention is clearly illustrated in the accompanying drawings, which, with the letters of reference marked thereon, form a part of this application, and in which drawings- Figure lis a side elevation of my improved ore-roasting furnace. Fig. 2 is a vertical cross sectional view through the furnace. Fig. 3 is a vertical longitudinal sectional view; and Fig. 4 is an end view of the furnace, showing in side elevation the means for tilting the furnace. Fig. 5 is a sectional detail view showing the outlet end of the roastingfurnace.

Reference now being had to the details of the drawings by letter, A designates a furnace, which in the drawings is shown of cylindrical form, although I do not confine my invention to any particular shape of furnace, the latter being provided with heads B, which are strengthened by reinforcements or buckstaves integral with same. Said heads are provided with lianges, to which the outer shell of the furnace is bolted. Each head is provided with a shaft D, which may be either solid or hollow, in which latter case the hollow shaft may be used for the purpose of conveying away the gases from the material under treatment. To the outer end of one shaft is formed a flange D', to which the flanged end of a pipe E is fastened in any suitable manner. Said pipe E has an upwardly-extending portion F, which connects with an elbow secured over an aperture in the upper portion of the furnace A. A second pipe G connects with the horizontal portion of the pipe F, affording a second passage-way from the upper portion of the furnace to pipe F for the escape of gases from the furnace. The portion of the pipe F which projects below the horizontal pipe E has a flanged end K, to which a cap may be fastened to close the opening therein, but made so as to be easily removed when it is desired` to clear out' the pipes.

At suitable locations about the circumference to the furnace are arranged openings N, over which doors N are fastened and through which access may be had to the interior of the furnace for building up same, for repairs, or for other purposes, and each door is provided with a sight-aperture, over which a door M is pivoted. At the upper portion ofthe furnace is a hopper H, leading from which is a passage-way through which the material to be roasted is fed.

The interior of the furnace, which is lined with a suitable tiling or brickwork J, has a series of-superimposed tiled beds or shelves R, R', R2, R3, and R4, supported on projecting blocks Rfrom the end and partition walls of the furnace, which are alternately arranged in reverse order, each bed or shelf being disposed at a slight angle to the neXt adjacent bed or shelf, this arrangement being for the purpose of preventing the material being roasted from falling back upon the shelf or bed on a reverse tilting movement of the furnace.

For tilting the furnace, to be done by the machinery at suitable intervals, I provide a crank-arm Q, Fig. 4, which is fastened to one of said shafts and has a pivot-pin O adjustably held in an elongated slot O in said crankarm, to which pin a pitman S is connected at one of its ends, while at its other end it is pivotally connected to a Wheel T, having circumferential teeth in mesh with a worm P, whereby a rotary motion is imparted to the wheel T to drive the pitman and cause the furnace to tilt.

As shown in the drawings, there are two series of beds on either side of the central wall of tiling I, and there may be any number of compartments and shelves or beds.

The operation of my furnace is as follows: Having produced sufficient heat by artificial means to ignite the material containing sulfur or other combustible properties, the ore is introduced through the hopper and drops upon the upper shelf or bed R As the furnace tilts slowly in one direction toward the free end of the shelf R the charge of material will fall by gravity toward the free edge of the shelf, covering same, and falls upon the shelf R' below, the tilting of the furnace being the same forward past the center and backward by the center. It will be observed that while the angle of the bed or shelf R is steep enough on the forward motion to allow the material to run off onto shelf R' the tilting in the reverse direction to discharge the material onto shelf R2 will not cause the angle of shelf R to be steep enough to allow the material to run back to the point of entering the furnace or to move toward the hopper. The conditions will be the same through the various shelves. the shelves R, R3, and R5 will discharge onto the beds below, which are R2 R4M and the shell, respectively. As the material reaches the lower portion of the furnace it will be discharged through valve-regulated outlet W. Said outlet affords opportunity also for the ingress of air necessary for combustion purposes and to properly treat the ore as the valve-regulated damper is opened as the furnace tilts in one direction.

By the provision of apparatus made in accordance with my invention it will be observed that all working parts, as stirrers, are dispensed with, together with shafts to move same, and affording a saving, by reason of there being no cause to stop for repairs, entailing not only loss in parts of furnace machinery, but loss in production, and by reason of the fact that only the amount of air On the forward motion j necessary for the treatment of the material being roasted or the amount to properly oxidize the gases when used to produce acid can enter the furnace advantages are derived superior to roasters commonly in use.

Having thus described my invention, what I claim to be new, and desire to secure by Letters Patent, is.

1. A tilting ore-roasting furnace having alternately and reversely arranged and inclined beds or shelves superimposed'one above another, as set forth.

2. An ore-roasting furnace having alternately and reversely arranged superimposed shelves overlapping one another and inclined, and means for rocking the furnace on its longitudinal axis, as set forth.

3. A tilting ore-roasting furnace having reversely-arranged shelves, those of the latter which project from the walls of the furnace in the same direction being parallel to one another and at slight inclinations to the shelves which extend in the reverse direction, as set forth. l

4. An ore-roasting furnace having alternately and reversely arranged shelves the shelves of each series being at inclinations to each other, a shaft on which the furnace is mounted, and a crank and pitman for tilting the furnace, as set forth.

5. In an ore-roasting furnace, a series of superimposed and inclined shelves as described, a shaft on which the furnace is mounted, means for rocking the shaft, a valve-regulated outlet to the furnace, and a series of doors about the circumference of the furnace covering openings therein, as set forth.

6. In combination with an ore-roasting furnace, a series of superimposed and inclined j shelves, shafts secured to the ends of said furj nace, and mounted in suitable bearings, pipes leading from the furnace and connected to one of said shafts and means for rocking said shafts, as set forth.

7. In combination with an ore-roasting furand inclined shelves, shafts secured to the ends 'of the furnace and mounted in suitable bearings, a fian ged pipe secured to the flanged end of 011e of said shafts, a pipe leading from the furnace and connected to and communieating with said flanged pipe, as set forth.

8. In combination with the outer shell of the furnace, the ends with shafts projecting therefrom, iianges on said heads, a flanged pipe fastened to one of said shafts, and pipes connected to the furnace and communicating with said fianged pipe, a hopper mounted on the furnace and a valve-regulated outlet at the lower portion of the furnace, and shelves as described. i

9. In combination with a cylindrical shell, cylinder-heads having flanges extending over said shell bolts fastening said heads together,

IOO

tiling Within said shell, shelves arranged in In testimony whereof I hereunto affix my reverse directions and inclined as described, signature in presence of two Witnesses. blocks projecting from the tiling to support v said shelves, shafts projecting from the ends ALBERF C' JOHNSON' of the furnace, pipes for conveying the gases Witnesses:

from the furnace, and means for rocking the ENOCH HABLAN,

latter as set forth. t HARRY L. PRICE. 

